/* ===== 基础 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background: #fff;
    color: #1a1a1a;
    padding: 24px 20px;
}

.container {
    max-width: 860px;
    margin: 0 auto;
}

h1 {
    font-size: 18px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 20px;
    text-align: center;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 14px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 16px;
}

/* ===== 标签页 ===== */
.tabs {
    display: flex;
    margin-bottom: 24px;
    border-bottom: 1px solid #e5e5e5;
    overflow-x: auto;
}

.tab {
    padding: 8px 16px;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    font-size: 13px;
    color: #999;
    transition: color 0.15s, border-color 0.15s;
    white-space: nowrap;
    flex-shrink: 0;
}

.tab:hover {
    color: #1a1a1a;
}

.tab.active {
    color: #1a1a1a;
    border-bottom-color: #1a1a1a;
    font-weight: 500;
}

/* ===== 面板 ===== */
.panel {
    display: none;
}

.panel.active {
    display: block;
}

/* ===== 输入组 ===== */
.input-group {
    margin-bottom: 16px;
}

label {
    display: block;
    margin-bottom: 4px;
    color: #666;
    font-size: 12px;
    font-weight: 500;
}

textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    font-family: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
    font-size: 13px;
    line-height: 1.5;
    resize: vertical;
    background: #fafafa;
    color: #1a1a1a;
    transition: border-color 0.15s;
}

textarea:focus {
    outline: none;
    border-color: #1a1a1a;
    background: #fff;
}

/* 防止URL输出框自动换行 */
#urlOutput {
    white-space: pre;
    overflow-x: auto;
    word-wrap: normal;
    overflow-wrap: normal;
}

input[type="text"],
input[type="number"] {
    padding: 8px 10px;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    font-size: 13px;
    background: #fafafa;
    color: #1a1a1a;
    transition: border-color 0.15s;
}

input[type="text"]:focus,
input[type="number"]:focus {
    outline: none;
    border-color: #1a1a1a;
    background: #fff;
}

input[type="number"].input-short {
    width: 120px;
}

input[type="radio"] {
    margin-right: 6px;
    width: auto;
}

/* ===== 按钮 ===== */
.button-group {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

button {
    padding: 8px 16px;
    background: #1a1a1a;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: opacity 0.15s;
}

button:hover {
    opacity: 0.8;
}

button:active {
    opacity: 0.7;
}

button.secondary {
    background: #f0f0f0;
    color: #1a1a1a;
}

button.secondary:hover {
    background: #e5e5e5;
    opacity: 1;
}

textarea + button.secondary {
    margin-top: 8px;
}

button.danger {
    background: #f0f0f0;
    color: #999;
}

button.danger:hover {
    background: #e5e5e5;
    color: #666;
    opacity: 1;
}

.btn-large {
    font-size: 14px;
    padding: 10px 20px;
}

/* ===== 输出框 ===== */
.output-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* ===== 统计信息 ===== */
.stats {
    display: flex;
    gap: 16px;
    padding: 10px 0;
    margin-top: 12px;
    border-top: 1px solid #f0f0f0;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.stat-value {
    font-size: 13px;
    font-weight: 600;
    color: #1a1a1a;
    font-variant-numeric: tabular-nums;
}

.stat-label {
    font-size: 12px;
    color: #999;
}

/* ===== 示例提示 ===== */
.example {
    margin-top: 4px;
    font-size: 11px;
    color: #bbb;
}

/* ===== 预览容器 ===== */
.preview-container {
    background: #fafafa;
    padding: 12px;
    border-radius: 6px;
    min-height: 80px;
    max-height: 400px;
    overflow-y: auto;
    border: 1px solid #e0e0e0;
}

.placeholder-text {
    color: #ccc;
    text-align: center;
    font-size: 13px;
}

/* ===== 大号数值展示 ===== */
.display-value {
    font-size: 28px;
    font-weight: 600;
    text-align: center;
    padding: 16px;
    background: #fafafa;
    border-radius: 6px;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.02em;
}

.display-value.color-green,
.display-value.color-blue {
    color: #1a1a1a;
}

/* ===== 工具类 ===== */
.mt-20 {
    margin-top: 16px;
}

/* ===== 分隔线 ===== */
.section-divider {
    margin: 24px 0;
    border: none;
    border-top: 1px solid #f0f0f0;
}

/* ===== 格式选项 ===== */
.format-options {
    display: flex;
    gap: 16px;
    margin-top: 8px;
}

.format-options label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 13px;
}

/* ===== 表格 ===== */
table {
    width: 100%;
    border-collapse: collapse;
}

th {
    background: #fafafa;
    color: #1a1a1a;
    padding: 6px 8px;
    text-align: left;
    border-bottom: 1px solid #e0e0e0;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

td {
    padding: 5px 8px;
    border-bottom: 1px solid #f0f0f0;
    font-size: 12px;
    color: #333;
}

tr:last-child td {
    border-bottom: none;
}

/* ===== 数字组合查找器 ===== */
.sf-input-row {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
}

.sf-input-row .sf-left {
    flex: 1;
    min-width: 0;
}

.sf-input-row .sf-right {
    flex: 0 0 148px;
}

.sf-summary {
    font-size: 13px;
    color: #666;
    margin-bottom: 10px;
    text-align: center;
}

.sf-summary b {
    color: #1a1a1a;
    font-weight: 600;
}

.sf-mark-table {
    background: #fafafa;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    overflow: hidden;
}

.sf-mark-row {
    display: flex;
    border-bottom: 1px solid #f0f0f0;
    padding: 5px 16px;
    font-size: 13px;
    line-height: 1.5;
}

.sf-mark-row:last-child {
    border-bottom: none;
}

.sf-mark-row .num {
    flex: 0 0 80px;
    font-family: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
    text-align: right;
    padding-right: 16px;
}

.sf-mark-row .tag {
    flex: 1;
}

.sf-mark-row.g1 .num, .sf-mark-row.g1 .tag { color: #16a34a; font-weight: 600; }
.sf-mark-row.g2 .num, .sf-mark-row.g2 .tag { color: #2563eb; font-weight: 600; }
.sf-mark-row.g3 .num, .sf-mark-row.g3 .tag { color: #d97706; font-weight: 600; }
.sf-mark-row.g4 .num, .sf-mark-row.g4 .tag { color: #7c3aed; font-weight: 600; }
.sf-mark-row.g5 .num, .sf-mark-row.g5 .tag { color: #e11d48; font-weight: 600; }
.sf-mark-row.g6 .num, .sf-mark-row.g6 .tag { color: #0d9488; font-weight: 600; }
.sf-mark-row.g7 .num, .sf-mark-row.g7 .tag { color: #c026d3; font-weight: 600; }
.sf-mark-row.g8 .num, .sf-mark-row.g8 .tag { color: #ca8a04; font-weight: 600; }
.sf-mark-row.empty .num, .sf-mark-row.empty .tag { color: #bbb; }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .output-grid {
        grid-template-columns: 1fr;
    }

    .tab {
        padding: 8px 12px;
        font-size: 12px;
    }

    .stats {
        flex-wrap: wrap;
        gap: 8px 16px;
    }

    .format-options {
        flex-direction: column;
        gap: 8px;
    }

    .sf-input-row {
        flex-direction: column;
    }

    .sf-input-row .sf-right {
        flex: none;
    }

    .sf-mark-row .num {
        flex: 0 0 64px;
        padding-right: 10px;
    }
}